Commit | Line | Data |
---|---|---|
9b1b0e42 | 1 | #include <linux/seq_file.h> |
1c4248ca | 2 | #include <linux/cpumask.h> |
736baef4 JR |
3 | #include <linux/kernel.h> |
4 | #include <linux/string.h> | |
5 | #include <linux/errno.h> | |
98f1ad25 | 6 | #include <linux/msi.h> |
5afba62c JR |
7 | #include <linux/irq.h> |
8 | #include <linux/pci.h> | |
a62b32cd | 9 | #include <linux/irqdomain.h> |
98f1ad25 JR |
10 | |
11 | #include <asm/hw_irq.h> | |
12 | #include <asm/irq_remapping.h> | |
1c4248ca JR |
13 | #include <asm/processor.h> |
14 | #include <asm/x86_init.h> | |
15 | #include <asm/apic.h> | |
5fc24d8c | 16 | #include <asm/hpet.h> |
736baef4 | 17 | |
8a8f422d | 18 | #include "irq_remapping.h" |
736baef4 | 19 | |
95a02e97 | 20 | int irq_remapping_enabled; |
03bbcb2e | 21 | int irq_remap_broken; |
736baef4 JR |
22 | int disable_sourceid_checking; |
23 | int no_x2apic_optout; | |
24 | ||
b7d20631 | 25 | int disable_irq_post = 0; |
3d9b98f4 | 26 | |
7fa1c842 | 27 | static int disable_irq_remap; |
736baef4 JR |
28 | static struct irq_remap_ops *remap_ops; |
29 | ||
1c4248ca JR |
30 | static void irq_remapping_disable_io_apic(void) |
31 | { | |
32 | /* | |
33 | * With interrupt-remapping, for now we will use virtual wire A | |
34 | * mode, as virtual wire B is little complex (need to configure | |
35 | * both IOAPIC RTE as well as interrupt-remapping table entry). | |
36 | * As this gets called during crash dump, keep this simple for | |
37 | * now. | |
38 | */ | |
93984fbd | 39 | if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config()) |
1c4248ca JR |
40 | disconnect_bsp_APIC(0); |
41 | } | |
42 | ||
43 | static void __init irq_remapping_modify_x86_ops(void) | |
44 | { | |
71054d88 | 45 | x86_io_apic_ops.disable = irq_remapping_disable_io_apic; |
1c4248ca JR |
46 | } |
47 | ||
736baef4 JR |
48 | static __init int setup_nointremap(char *str) |
49 | { | |
95a02e97 | 50 | disable_irq_remap = 1; |
736baef4 JR |
51 | return 0; |
52 | } | |
53 | early_param("nointremap", setup_nointremap); | |
54 | ||
95a02e97 | 55 | static __init int setup_irqremap(char *str) |
736baef4 JR |
56 | { |
57 | if (!str) | |
58 | return -EINVAL; | |
59 | ||
60 | while (*str) { | |
b7d20631 | 61 | if (!strncmp(str, "on", 2)) { |
95a02e97 | 62 | disable_irq_remap = 0; |
b7d20631 FW |
63 | disable_irq_post = 0; |
64 | } else if (!strncmp(str, "off", 3)) { | |
95a02e97 | 65 | disable_irq_remap = 1; |
b7d20631 FW |
66 | disable_irq_post = 1; |
67 | } else if (!strncmp(str, "nosid", 5)) | |
736baef4 JR |
68 | disable_sourceid_checking = 1; |
69 | else if (!strncmp(str, "no_x2apic_optout", 16)) | |
70 | no_x2apic_optout = 1; | |
b7d20631 FW |
71 | else if (!strncmp(str, "nopost", 6)) |
72 | disable_irq_post = 1; | |
736baef4 JR |
73 | |
74 | str += strcspn(str, ","); | |
75 | while (*str == ',') | |
76 | str++; | |
77 | } | |
78 | ||
79 | return 0; | |
80 | } | |
95a02e97 | 81 | early_param("intremap", setup_irqremap); |
736baef4 | 82 | |
03bbcb2e NH |
83 | void set_irq_remapping_broken(void) |
84 | { | |
85 | irq_remap_broken = 1; | |
86 | } | |
87 | ||
959c870f FW |
88 | bool irq_remapping_cap(enum irq_remap_cap cap) |
89 | { | |
90 | if (!remap_ops || disable_irq_post) | |
30e93761 | 91 | return false; |
959c870f FW |
92 | |
93 | return (remap_ops->capability & (1 << cap)); | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(irq_remapping_cap); | |
96 | ||
c392f56c | 97 | int __init irq_remapping_prepare(void) |
736baef4 | 98 | { |
95a02e97 | 99 | if (disable_irq_remap) |
c392f56c | 100 | return -ENOSYS; |
736baef4 | 101 | |
30969e34 JL |
102 | if (intel_irq_remap_ops.prepare() == 0) |
103 | remap_ops = &intel_irq_remap_ops; | |
104 | else if (IS_ENABLED(CONFIG_AMD_IOMMU) && | |
105 | amd_iommu_irq_ops.prepare() == 0) | |
a1dafe85 | 106 | remap_ops = &amd_iommu_irq_ops; |
30969e34 JL |
107 | else |
108 | return -ENOSYS; | |
109 | ||
110 | return 0; | |
736baef4 JR |
111 | } |
112 | ||
95a02e97 | 113 | int __init irq_remapping_enable(void) |
736baef4 | 114 | { |
1c4248ca JR |
115 | int ret; |
116 | ||
e9011760 | 117 | if (!remap_ops->enable) |
736baef4 JR |
118 | return -ENODEV; |
119 | ||
1c4248ca JR |
120 | ret = remap_ops->enable(); |
121 | ||
122 | if (irq_remapping_enabled) | |
123 | irq_remapping_modify_x86_ops(); | |
124 | ||
125 | return ret; | |
736baef4 | 126 | } |
4f3d8b67 | 127 | |
95a02e97 | 128 | void irq_remapping_disable(void) |
4f3d8b67 | 129 | { |
e9011760 JL |
130 | if (irq_remapping_enabled && remap_ops->disable) |
131 | remap_ops->disable(); | |
4f3d8b67 JR |
132 | } |
133 | ||
95a02e97 | 134 | int irq_remapping_reenable(int mode) |
4f3d8b67 | 135 | { |
e9011760 JL |
136 | if (irq_remapping_enabled && remap_ops->reenable) |
137 | return remap_ops->reenable(mode); | |
4f3d8b67 | 138 | |
e9011760 | 139 | return 0; |
4f3d8b67 JR |
140 | } |
141 | ||
95a02e97 | 142 | int __init irq_remap_enable_fault_handling(void) |
4f3d8b67 | 143 | { |
70733e0c JR |
144 | if (!irq_remapping_enabled) |
145 | return 0; | |
146 | ||
e9011760 | 147 | if (!remap_ops->enable_faulting) |
4f3d8b67 JR |
148 | return -ENODEV; |
149 | ||
150 | return remap_ops->enable_faulting(); | |
151 | } | |
0c3f173a | 152 | |
6a9f5de2 JR |
153 | void panic_if_irq_remap(const char *msg) |
154 | { | |
155 | if (irq_remapping_enabled) | |
156 | panic(msg); | |
157 | } | |
9b1b0e42 | 158 | |
947045a2 | 159 | void ir_ack_apic_edge(struct irq_data *data) |
9b1b0e42 JR |
160 | { |
161 | ack_APIC_irq(); | |
162 | } | |
163 | ||
947045a2 JL |
164 | /** |
165 | * irq_remapping_get_ir_irq_domain - Get the irqdomain associated with the IOMMU | |
166 | * device serving request @info | |
167 | * @info: interrupt allocation information, used to identify the IOMMU device | |
168 | * | |
169 | * It's used to get parent irqdomain for HPET and IOAPIC irqdomains. | |
170 | * Returns pointer to IRQ domain, or NULL on failure. | |
171 | */ | |
172 | struct irq_domain * | |
173 | irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info) | |
174 | { | |
175 | if (!remap_ops || !remap_ops->get_ir_irq_domain) | |
176 | return NULL; | |
177 | ||
178 | return remap_ops->get_ir_irq_domain(info); | |
179 | } | |
180 | ||
181 | /** | |
182 | * irq_remapping_get_irq_domain - Get the irqdomain serving the request @info | |
183 | * @info: interrupt allocation information, used to identify the IOMMU device | |
184 | * | |
185 | * There will be one PCI MSI/MSIX irqdomain associated with each interrupt | |
186 | * remapping device, so this interface is used to retrieve the PCI MSI/MSIX | |
187 | * irqdomain serving request @info. | |
188 | * Returns pointer to IRQ domain, or NULL on failure. | |
189 | */ | |
190 | struct irq_domain * | |
191 | irq_remapping_get_irq_domain(struct irq_alloc_info *info) | |
192 | { | |
193 | if (!remap_ops || !remap_ops->get_irq_domain) | |
194 | return NULL; | |
195 | ||
196 | return remap_ops->get_irq_domain(info); | |
197 | } |